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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba928a67f4920b5bccba0a7f01473b591d0700fad4f6762f41d5fd7089d2037' 
  AND token = 'or7mWTwSn/H6eSlaENfJ1w5eW5ufhYI+8CZttYE5rk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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