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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6d5308c2e171ff1b57f871e26172aa91887bd6bf892731c293a78a7cd761db8' 
  AND token = '/IYvdTYDZ7L8sVy9dfGXmT3tYfnGfKM5u1yHTJd0XMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00108

JSON explain

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