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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a4c305df341d0cf71fef4dc3ff2b34dee55df0ac021a34e3e1324b01fe3dbe' 
  AND token = 'lf61TddhSiY5VuhFIiSIB3DVat8wQpXPMph3tLHHZvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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