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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d5e0a82c69ae51df8c5d553e41ff9d0242176f4975f253e772b6905477a9ca' 
  AND token = 'eai0ltrBFZzF9RgqWSfnU7qt3ycYGiFG4jIOV0prIrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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