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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c2494e0a663aa6f8d96a649b0f3b6120e9f103272647bede4b141dd543e147' 
  AND token = 'IAl4Utpi2YfWledDj+WOeaB9Gj/nhyX1Aq3bkGuEFKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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