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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '141695ab3563cea7dac1f4274549d3efecbf10ab9073947e79ffc9c26515cb9a' 
  AND token = 'v8QYlozwWcnkhbaykoXOHlt8Qdf65ARHs2/DuE3n1Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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