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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf83b36ec698b0d9e483b3aa0a118f144ca904a3c6a27534368ad453a10d8a50' 
  AND token = 'j/m+X9bR7iBc0yQiRMOPscOJQqnrceT2LKjGdXS1QIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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