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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace1a650e0ea01b2b9ef188fa93033b2eae8d4963754d8426f52f439d8445d0c' 
  AND token = 'lCXOICjgcgr7i0Gsv9P+ehf8gW/Nizac1We7inJHFXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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