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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c3ac88f233a6c58e5e2ae45c7484759edc75e017114f3e64134f5650efaea9a' 
  AND token = 'wRLXrZt8/iiUIF6UQk81oJ0N34rkGAwx67vgGcBD21Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}