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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78a507b1a814195d6692542512175a2b8efe7a13a09e9d5bcd66fddfec741867' 
  AND token = 'KS37Rhsr8f3qvlA2TVchDJVdd+MVzvHlzeWp9h17PkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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