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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1cfc4d366c5f97a16ce4604986a235aaa3e3641d7682c38090b2b1ee7af9d93' 
  AND token = 'uQzpKcLFZmAeuflCdEmCNNImcNqzrYYjFnGOd9pFrjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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