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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abff423402d3b00dbfe19de52c8372bbc094c730f9fe49d0441615ddfb47dc78' 
  AND token = 'SB1/pqB5LQ+DfT02EeJ+cYU1K0Ft1vDlwOjW7Mwp33w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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