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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c3b5582cdbc98bc5c831ca453ad05f19bc483b8e007ad57496cc2419db9bae0' 
  AND token = '6rVTyld1Owg+vEImjzbpIB4hQbasBUkq5H6HKF2PWIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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