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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd37a1a88b6dd2cff22a0f2d1f5c8555021d353f9fd16b9f6eeb5c6b3ecd2f17' 
  AND token = 'YRCDAdlstWEulgspbM6LkT8RFf+znOCTGOR7Cp7kqjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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