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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dacab5b64452ae737b1e6d210e08c76c8bd1f9c88ea108fd6f9e804f81b94a7' 
  AND token = '5/sk9o0L6ikKveA3Yz5vmaY3VtmC8fDQoXHE9OW/XaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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