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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde97551440bdf02a1c105783b4eef63224621b576052c51b42ba99eaeeae433' 
  AND token = 'VacO68VL92/VRpgPUe2P19zvdvJQaNxOD9ozHRgTm5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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