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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617d82b8db1a9fce91abacc15ba6cd108c144277c42c7b489a9228631b19cde0' 
  AND token = 'EgDJNo5Lr5Xf+isOqZ2QXIBaN3HBhdQpZNN5ACcIG9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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