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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e82ac846f200ed0d3d4cfa847dd80d61f75bad9288176e302f0bc9268e15aa60' 
  AND token = 'FDh8Nkqd2j3yW4qmSNd2ktLPYFsqKsuWNpuZ2QL2kPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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