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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bae93700f3c686d59b7456d10335d64b56b0bdef1b5c58747eba67b7c297f57' 
  AND token = 'X0XDDOsYYNv5/YkG5iJ2aO+oTzJGGfz+XSmMNhz/dvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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