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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69b8ee84f57ab5564dc788ed4154313530309af41a7f912273a67bb7b83cfb9' 
  AND token = 'CqoW9IdaA2xk6PJPpfqepq7cL/Yt32lHszR63HWG/9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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