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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d9c888440b41856d340f2b898713bf1882c6d4f4d59426cb7a87d7e40b5a513' 
  AND token = 'FPuAPLjSMqeKXFWuDA9PCVERlXkdq9w6FatJW0c7XrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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