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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85a400c01706cea7041e845ae263c1680ad748724d5d430b765e0a4ace6018f' 
  AND token = 'gcH7G8r2wk/riiVsnQKMpxhsv2broBSkz0V6rI8vekE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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