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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc80739365a36912ff8d1efd7a944695820e5f7a7178aec02f7f3f83099d3ebb' 
  AND token = '5r6I1QlUNfxpQPJQZmHqigbxMim+eSREI15kqDTAFms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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