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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09cb304fc939f0300ddced4d7ec4c16d99e06192fc4938b2570a0356c89008f4' 
  AND token = 'MfvIcFGXTt86hqmJpND2tn6GhwLHBx2uikS0veEfpn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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