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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4525c2019b6feb9efba1dc29a35cc9d2206d9fc663282081648f9e50be9199' 
  AND token = '7UoEdhjmA31D+FSHRqpVa0GEhd00powRsK/el7qLOZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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