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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '398085ade92f239d4c038d9745bde2094dc43cd6e25bb2eb0e8597c4a29d5cf2' 
  AND token = '6rY6XplOvE88lrWbUFER3Q27MrLX/k/aep/3Vwwoi8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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