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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21043b6afc9e26adc1804533d52640e493cd083e8b6fee24107a84c92e6b9b65' 
  AND token = 'ZRLliCR6ePXE07q3ED83Yo8Eb7CsMHPPg6t029HSkh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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