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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a62320859465ba62e068e9fa4e8d9892e7abd8a9313c052ed88c5f0d08bbc21' 
  AND token = 'nAgaut36K/hsoqKUCRKPZo13MziZEMNVk/9NVpJi3+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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