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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3389a672e108273e711d8c65e8616b261118760177a4846a2eb48a0fc7d61548' 
  AND token = 'CSthfUThXTg3YzvyXVfUI5kQlX9NgA7y5PrC3RlziWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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