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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc40d24cd1f9980061b04f714f09fd4b644a0ddfd94085076540c9c49ae2b0b' 
  AND token = 'SIh7MRSlNtvHITTYa7v+kBjbHr6k23gMvsz7t+pl0E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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