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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24b54736bf663ad4447740adc302e4b9b66858c2e915d0ffc25d147cafa434ca' 
  AND token = 'C7xZ3Ic1Vk9qtReI0GZWyF05tNPTBtDH9QGDaYi1RV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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