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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936560a250eeb1ab79b046f57460026a48c428b1628eaea570de8dfda1dec793' 
  AND token = 'CnA0lReEVAqUi9p8TVF/g41hgbITAP4XN/oO25z2nmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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