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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a4dac23b033671a0d9ac48b80915dbe788ce2535ac7cbfc37f4d15cccfc6507' 
  AND token = 'tpmwQk9/21UBdg3C4WYvS0dvhmsKbxbyB6y4ZH82BaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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