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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73b235ece7c0a95ea2e9394fd0a877601eb8fb8b210fd112c06d143bc36cb33c' 
  AND token = '9wyobdsWht8QEW0CHJGLGfNBBXhX/R0MmVNaihIDrus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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