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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5948f6034d57cc34895840136a099bb5045c4ee507242409b6952415453b6d4' 
  AND token = '5iL4al9t5g0J8mFfEh1QrdZam1uR+zkgySlA1EH8a9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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