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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3503a2d8f86cd39618e3aa7765de7cc6efe01a6649ec5d5fafbbf3986e6cc89' 
  AND token = 'iucwo0tMkzBr0P5A4pv0rOQUFGKqh4tQ6UDhdBEyMyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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