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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a022bd7bbd57257b8a0b69e4677dc66d4b35de2dabba578e1cfe615169fc89' 
  AND token = 'iNQ1sKCqu6HRnggW2bEjIO8G/mU/sYar2ICje9b/4ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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