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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9f35a5cd749829f59e516e271cd88a7cd53733221ee23da2207a0e25de1021' 
  AND token = 'hzbl4Q2ieouaMH9DefqPNIY20rIoRlXNEpxlPH0dAq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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