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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dfbc10b9c976725bfababa5600d1484260280e35d41330926cf947c43bbd495' 
  AND token = 'Aly0l0jJcVtxcqp3r66MaXQwrbHQO1xtwBGk9LOf5As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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