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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6637f799182fe4260d21c92635ee004ee74bb6238f4b10afd3aa65ef53d8bb80' 
  AND token = 'UQ7/cyveFnZI9Cc7gfX+gXa/0yGtxRZ0Cht4BhQybCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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