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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a966d760a2b9bb5fa84429a1919c377bada310b824d66d1b3166e1e487d84c4' 
  AND token = 'xiYznnc4eRkZG624LMXcZ+KqXfnQt1LzKzMjoWFK4Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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