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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92cdb0ff84123bf76df2594499a56419d15529132074dfbbefe7b2998b4a07a' 
  AND token = 'u2DKf3QhK313eCg89FGO1gT2o2vFvRb1bBZlxtY7rrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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