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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99151d8daebe8df3cb1298e0178c4632a138f00d711b770cbf3b01716592d198' 
  AND token = 'SXNWI0W22T5PGKWNSNTCCvGIfkOEzmyo4DB4zbL7dpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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