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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4933b5de0ace10cbadb618ca74be119623a68acbe2735a9c06f832de658df28' 
  AND token = 'm2tPBK/VNtkONtq2X8RGvg1GErkk4oULtRduRYjdfE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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