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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10d0530fea30ac17af3748745717e60fe83f87157f67128a0847a171f3b7f16a' 
  AND token = 'EfcO5klvzJD77lyP+VxnhdIbRc0ZxpCFl4nRZ2+KGeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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