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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc014e5898494b4ad4ac6e81948715eebba5ff4fe7e7c909d3db233f0312a64' 
  AND token = 'QwZrytV9FQ4sC1p/Ps83WDktKZ4YYkJvH5FGqir3JfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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