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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd588326daa744b0ad1c8e1e84d5fd1cb7a4bd3b54670cb8f6b0f7f2ff478f4f8' 
  AND token = 'Sl8aglEcdRBwGt45ANcuxE9g1YzMRN3QYieeH8/32IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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