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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20da6a1b17773e9072b599b8ecbc7e0ee82b35cadb356a519d156cf42f97c45a' 
  AND token = 'ttHK1leTPRNa9OG5LPEHLo6F6fEnnPxgJyu7nPkqgsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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