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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d29b640771965b2531e7df558e722d302aa0fef1af34523b43c39c44812fa1c' 
  AND token = '8W6fIgELy9K17MjnOcKmrKG8GfhkkCIHwZOJ18PljHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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