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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928db2321553c110c5d35f9dcc4c857ed2d18913f60ec234909890f48496b0da' 
  AND token = '7cUeMYj5telAe4FjEonlFlLlIfZBqX+g1dP0pclrg94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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