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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4c47727d3ac6b96bed95613725b94a29e508eabb6780f69fb8b1aacd52fc92' 
  AND token = 'pj8fPYZAbbg6e7IK9+naiGwqWKSOH/ntN787xQonQjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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