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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1909eed2c2b9a248dc598e1044bb91c727bf0e9ebdf5db111dd251d03c0579b9' 
  AND token = 'qgGO/fhQyo/lCU2AC1OYKAxdOJmfSepSzPcP3l9eADE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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