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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c390592e79b6dc897638230b4e96ae0f67310bf130e1a30c1f3b4db6297abe5' 
  AND token = 'o6hWBqyP+f7nve7K8e72bhhxcFfeslRDhPq/4cBFbFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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