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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b942d170c9649b97132b53d187d1bbbbda841c80736bc81fd877c7ac0431ff' 
  AND token = '35bQkqqhk+RDS188G9UmUHGcBEnL3nAsUs1O3DGsNFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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