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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6441de23a5d0f3e2f8455529008af452915a40220b6fe9cc3e17ef151b4fcb09' 
  AND token = 'an5ja5qxj7fdB3BUOJNZ4tXH8/v96kJ83+/3JDsgiZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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