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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c491687e383932ec989bbfe712f7a6e7829ddc58606bb2bca24f78a84dcdccce' 
  AND token = 'oGcQbybK1BDrxJ1+xTe87LushhvbajrHJ2XHGoGG4xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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