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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7568f74fc8ab1d72a55e249351d0cebd8acf1d2013ce4f1342acbbc0d26d27bb' 
  AND token = 'papqqmyUAq3Smp5oDe4v/qqYi5nT901rbfEIkK9CGBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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