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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8819767670879ad928ef98f1b75a7667eb4b1cdc0ca26ef9b687e0c83e22d2' 
  AND token = 'BVd11AHKXUEJfG7x8SXSNUS1hZ9api21EXrP42V1HHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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