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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1afc75ac8c4a6167104ab5ec5a2d76bb0ccb715f26344804a306c41d686cc3' 
  AND token = 'QeM/cSEXy6Tpnjey3IAIcqekFIXOisBJ44r/PQq/pGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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