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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e2b3e888f9cd526adf520387071a7efea6b51ea3d65b70e6cdf6cd34fb463e' 
  AND token = 'TKhraZFmoae+dURDqm7vfp4qbUhUS3ALqeiv2synE9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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