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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1699ea764e5c6fe4d08e52e7617630469debab281274efff6781a642949f7539' 
  AND token = '5nSQ9meiaz1C5mPniAqzZE3bdpqTk80h6Sbe9oPfPBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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