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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22519eb93262e70e2972ed6b4e79d1545bd585e73cb11da6ddb8edb609f080c7' 
  AND token = '7JuRdLtcuO9N75nEgHXSlKQIekyhaF4LOgXqJ1ilKjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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