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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922c36123670c083115f5b92c541d72bef4d99771efde44f1b7f915dec9c4f7a' 
  AND token = 'gKdyBvnVEkNE93Lqr8mpHKO8p3encTLfPSypxMTSX0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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