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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda2d63f676ebb4fa0e254d420f094db443040c08ddcb01f5546796615c632dc' 
  AND token = 'dXLHi7AxtYvythDDIm2CyDXdjjoTpJ66ESGPnRYfNrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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