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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f5fe69606711d75299f6cabdab8f5d2c5a24cf3934be8dd27b1d1a855bdc16' 
  AND token = 'J31UkDXV6pM+Rg20hyuuk0cP6chuHOpgDjA56dhVr04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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