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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2041646b2e2da90daed765d1c9b4bfa008466ff92a9bdda0b2372304927c479' 
  AND token = 'LzirT7EakDjnskItNeLeW/yIWHeqnK/7mV8STA9N9MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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