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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e282d3d9bfe3928be1455d8fd8be5c47bcd07b1e9fd8bef8cbe56d93697109' 
  AND token = 'Tod9M88tuHkyncu+l++0UnGzopLmSoE1HpnzdFAjeGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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